The application server is responsible for generating a distributed execution plan for a multisite query or transaction and for supervising distributed execution by sending commands to servers. These commands include local queries and transactions to be executed, as well as commands to transmit data to other clients or servers. Another function controlled by the application server $($or coordinator$)$ is that of ensuring consistency of replicated copies of a data item by employing distributed $($or global$)$ concurrency control techniques. The application server must also ensure the atomicity of global transactions by performing global recovery when certain sites fail. Discuss with examples the architecture of application server in the context of Federated Database Schema Architecture